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Previously when there were negative timestamps, the tkhd duration was incorrectly equal to the full track duration rather than the presentation duration of the edit list. From the [docs](https://developer.apple.com/documentation/quicktime-file-format/track_header_atom/duration) - "The value of this field is equal to the sum of the durations of all of the track’s edits". PiperOrigin-RevId: 752655137
Test data module
Provides sample data for media unit and instrumentation tests.